CN114181613B - High-temperature-resistant heat-insulating anticorrosive coating and preparation method thereof - Google Patents
High-temperature-resistant heat-insulating anticorrosive coating and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
- C09D5/084—Inorganic compounds
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2244—Oxides; Hydroxides of metals of zirconium
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
Abstract
The invention discloses a high-temperature-resistant heat-insulating anticorrosive coating and a preparation method thereof, belonging to the technical field of surface treatment. The water-based paint is formed by mixing a component I and a component II, wherein the component II is tetraethoxysilane; the component I consists of a mixture of mixed resin, anticorrosive pigment, heat-insulating filler and diluent; the mixed resin is a mixture of a polysilazane precursor and an organic silicon resin, and the weight ratio of the polysilazane precursor to the organic silicon resin is 1-1.5: 2; the anticorrosive pigment is a mixture of siloxane modified strontium aluminum polyphosphate, organic zinc modified strontium potassium polyphosphate and basalt chopped fiber, and the weight ratio of the siloxane modified strontium aluminum polyphosphate, the organic zinc modified strontium potassium polyphosphate and the basalt chopped fiber is 1: 1-1.5: 0.3-0.5; the heat insulation filler is a mixture of zirconium oxide, tin antimony oxide and hollow glass microspheres, and the mixing weight ratio of the zirconium oxide, the tin antimony oxide and the hollow glass microspheres is 1.5-2: 1: 0.5-1; the diluent is a mixture of xylene and n-butanol, and the weight ratio of xylene to n-butanol is 7: 3. The coating has good high temperature resistance, heat insulation, corrosion resistance and cracking resistance.
Description
Technical Field
The invention discloses a high-temperature-resistant heat-insulating anticorrosive coating and a preparation method thereof, belonging to the technical field of surface treatment.
Background
The high temperature to which the heat affected zone of an aircraft is subjected can cause damage to surrounding electronic equipment, and therefore the heat affected zone must be protected from heat using a high temperature resistant insulating coating. Meanwhile, the aircraft can relate to the marine environment due to wide flight areas, so that the high-temperature heat-insulating coating must have certain corrosion resistance. In addition, some carbon steel heating furnaces in the industries of petrochemical metallurgy and the like also need to be thermally protected by coatings with high temperature resistance, heat insulation and corrosion resistance functions so as to solve the problems of oxidation, thinning and the like of furnace wall steel caused by thermal oxidation and corrosion of the carbon steel heating furnace. The temperature resistant grade required by the thermal protection industry reaches 600 ℃ and above. In response to the above requirements, thermal protection is usually performed by using heat-insulating tiles, asbestos felt or heat-insulating paint. The materials have obvious problems in the using process, the using process of the heat insulation tile and the asbestos felt is complex, the heat insulation tile and the asbestos felt need to be firmly bonded with the part needing heat protection by adopting a special process, and the materials can hardly be maintained if the parts are damaged locally; meanwhile, the manufacturing cost is high, the weight gain is obvious, and the implementation of the thermal protection object with a complex shape is difficult. The thermal protection is carried out by adopting the thermal insulation coating, the construction is convenient, the maintenance is simple, the thermal insulation effect is good, and the thermal protection coating is not limited by the size and the shape of a thermal protection part and becomes an important technical means of thermal protection. However, the existing heat insulation coating has fatal defects in the aspects of technology and process, in particular to a multifunctional integrated high-temperature heat insulation coating. The prior heat insulation coating technology has the problems that: if the temperature of the use temperature field of the heat-insulating coating reaches 600 ℃, the coating generally cracks and falls off when being coated thickly; the heat insulation coating with the maximum use temperature of 600 ℃ does not basically have enough anticorrosion performance; the existing heat-insulating coating is thicker in coating use thickness, and generally has considerable heat-insulating effect only by coating the coating with the thickness of 1-5 mm. Meanwhile, the coating can resist 600 ℃ for a long time, has a good heat insulation effect under the thickness of millimeter level, does not crack at high temperature, has good corrosion resistance, and is a special coating which is urgently needed by the industry. The invention obtains the multifunctional integrated coating with high temperature resistance, heat insulation and corrosion resistance and thin thickness through technical innovation and the preparation and use methods thereof.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a formula, a preparation method and a use method of a high-temperature-resistant, heat-insulating and corrosion-resistant multifunctional integrated coating. The ceramic filler or oxide with excellent high temperature resistance and low heat conduction coefficient is adopted to realize high-efficiency heat insulation. And basalt chopped fibers are adopted in a matching manner, so that the corrosion-resistant and heat-insulating effect is improved, the coating structure is reinforced, and the cracking problem of the heat-insulating coating at 600 ℃ is effectively solved. The two modified dicationic active anticorrosive pigments are prepared and added into the coating, so that the heat-insulating coating still can keep enough anticorrosive performance at high temperature, the novel dicationic anticorrosive pigment has better compatibility with a resin system, and the coating can be ensured to be more uniform and compact in texture after being cured and formed into a film, thereby being beneficial to the improvement of anticorrosive performance and the cracking resistance of the coating at high temperature. Based on the technical innovation, the invention introduces a preparation technology of a high-temperature-resistant, heat-insulating and anti-corrosion multifunctional coating capable of resisting 600 ℃ for a long time.
The technical scheme of the invention is as follows: a high temperature resistant heat insulation anticorrosive coating is formed by mixing a component I and a component II, wherein the component II is tetraethoxysilane; the component one consists of a mixture of mixed resin, anticorrosive pigment, heat-insulating filler and diluent; the mixed resin is a mixture of a polysilazane precursor and an organic silicon resin, and the weight ratio of the polysilazane precursor to the organic silicon resin is 1-1.5: 2; the anticorrosive pigment is a mixture of siloxane modified strontium aluminum polyphosphate, organic zinc modified strontium potassium polyphosphate and basalt chopped fiber, and the weight ratio of the siloxane modified strontium aluminum polyphosphate, the organic zinc modified strontium potassium polyphosphate and the basalt chopped fiber is 1: 1-1.5: 0.3-0.5; the heat insulation filler is a mixture of zirconium oxide, tin antimony oxide and hollow glass microspheres, and the mixing weight ratio of the zirconium oxide, the tin antimony oxide and the hollow glass microspheres is 1.5-2: 1: 0.5-1; the diluent is a mixture of xylene and n-butanol, and the weight ratio of xylene to n-butanol is 7: 3; in the first component, the mixed resin accounts for 25-30% of the weight of the mixture, the anticorrosive pigment accounts for 15-25% of the weight of the mixture, the heat-insulating filler accounts for 23-25% of the weight of the mixture, and the balance is diluent; the weight ratio of the component I to the component II is 100: 30-35.
The polysilazane precursor is any one of polysilazane precursors containing boron, zirconium or yttrium, or a mixture of any two of the polysilazane precursors containing boron, zirconium or yttrium in equal weight ratio.
The length range of the basalt chopped fiber is 1-5 mu m.
The wall thickness range of the hollow glass microsphere is 0.5-1 μm.
The diameter size range of the hollow glass microspheres is 8-15 mu m.
The hollow glass microspheres are made of borosilicate.
The zirconia is yttrium stabilized zirconia.
The method comprises the following steps:
(1) preparation of anticorrosive pigments
The preparation method of the siloxane modified strontium aluminum polyphosphate comprises the following steps of; respectively weighing ethanol, water, gamma-aminopropyltriethoxysilane and strontium aluminum phosphate according to the weight ratio of 0.2-1.0: 0.4-1.2: 0.03: 0.4, uniformly mixing the ethanol and the water, adding the gamma-aminopropyltriethoxysilane, uniformly stirring to form a mixed solution, adding the strontium aluminum phosphate into the mixed solution, carrying out condensation reflux for 6-10 h in a water bath at the temperature of 85-95 ℃, carrying out centrifugal separation and drying to obtain siloxane modified strontium aluminum polyphosphate;
the preparation method of the organic zinc modified strontium potassium polyphosphate comprises the following steps of; respectively weighing strontium potassium phosphate, benzotriazole, zinc acetate and N, N-dimethylformamide according to the weight ratio of 1.8-3.0: 1-1.2: 1: 40, mixing, condensing and refluxing for 6-10 h in an oil bath at 125 ℃, centrifuging and drying to obtain organic zinc modified strontium potassium polyphosphate;
(2) preparation of component one
Preparing materials: respectively weighing the mixed resin, the anticorrosive pigment, the heat-insulating filler and the diluent according to the proportion;
grinding: respectively adding an anticorrosive pigment, a heat insulation filler and a diluent into the mixed resin, uniformly stirring, grinding in a sand mill until the fineness is lower than 40 micrometers, and discharging to obtain a component I;
mixing a component I and a component II: and weighing the component I and the component II according to the proportion, and uniformly stirring to obtain the high-temperature-resistant heat-insulating anticorrosive anti-cracking coating.
The method comprises the following steps:
1) substrate surface treatment: blowing sand or polishing the surface of the substrate, and cleaning the surface of the substrate by using a cleaning agent such as solvent oil for later use;
2) coating: coating a coating with the thickness of 0.1-1 mm on the surface of the substrate with the treated surface by adopting an air spraying, brushing or roller coating method;
3) and (3) curing: baking the coated high-temperature-resistant heat-insulating anticorrosive paint in a drying oven at 200 ℃ for 3 hours to completely cure the coating;
4) the obtained high-temperature-resistant heat-insulating anticorrosive paint should be used up in 8 hours.
The invention has the advantages that: the formula, the preparation method and the using method of the high-temperature-resistant heat-insulating anticorrosive coating are provided, and the problems that the high-temperature-resistant heat-insulating anticorrosive coating cannot give consideration to high-temperature resistance, heat insulation and anticorrosive performance when the existing heat-insulating coating is used in parts needing heat protection, such as an aircraft heat affected zone, a heating furnace in the industries of petrochemical engineering metallurgy and the like, and meanwhile, the coating has poor adhesion at high temperature and is easy to crack, and the using thickness is too thick are solved. The mixture of the polysilazane precursor and the organic silicon resin is used in the coating, so that the coating has good high-temperature resistance. The optimized collocation of a plurality of heat insulation fillers ensures that the coating has good heat insulation performance. Meanwhile, the coating is made of a mixture of corrosion-resistant filler siloxane modified strontium aluminum polyphosphate, organic zinc modified strontium potassium polyphosphate and basalt chopped fiber, so that the coating has good corrosion resistance. The basalt chopped fiber has a structural reinforcing effect on the coating, and can effectively overcome the problem of high-temperature cracking of the coating. The main protective properties are as follows:
1. excellent high temperature resistance: the coating is baked for 1000 hours at 600 ℃, and the surface of the coating is complete and does not crack or fall off.
2. The corrosion resistance is excellent: the coating is coated on the surface of No. 45 carbon steel by 0.1mm, and the surface of the coating is complete and has no corrosion, no bubble and no shedding after 1000 hours of neutral salt spray.
3. The heat insulation performance is excellent: the coating with the thickness of 0.3mm has the heat insulation effect of 25 ℃; the coating with the thickness of 0.6mm has the heat insulation effect of 40 ℃; the coating with the thickness of 0.8mm has the heat insulation effect of 70 ℃.
Detailed Description
A high temperature resistant heat insulation anticorrosive coating is formed by mixing a component I and a component II, wherein the component II is tetraethoxysilane; the component one consists of a mixture of mixed resin, anticorrosive pigment, heat-insulating filler and diluent; the mixed resin is a mixture of a polysilazane precursor and an organic silicon resin, and the weight ratio of the polysilazane precursor to the organic silicon resin is 1-1.5: 2; the anticorrosive pigment is a mixture of siloxane modified strontium aluminum polyphosphate, organic zinc modified strontium potassium polyphosphate and basalt chopped fiber, and the weight ratio of the siloxane modified strontium aluminum polyphosphate, the organic zinc modified strontium potassium polyphosphate and the basalt chopped fiber is 1: 1-1.5: 0.3-0.5; the heat insulation filler is a mixture of zirconium oxide, tin antimony oxide and hollow glass microspheres, and the mixing weight ratio of the zirconium oxide, the tin antimony oxide and the hollow glass microspheres is 1.5-2: 1: 0.5-1; the diluent is a mixture of xylene and n-butanol, and the weight ratio of xylene to n-butanol is 7: 3; in the first component, the mixed resin accounts for 25-30% of the weight of the mixture, the anticorrosive pigment accounts for 15-25% of the weight of the mixture, the heat-insulating filler accounts for 23-25% of the weight of the mixture, and the balance is diluent; the weight ratio of the component I to the component II is 100: 30-35.
The polysilazane precursor is any one or a mixture of any two of polysilazane precursors containing boron, zirconium or yttrium in equal weight ratio.
The length range of the basalt chopped fiber is 1-5 mu m.
The wall thickness range of the hollow glass microsphere is 0.5-1 μm.
The diameter size range of the hollow glass microspheres is 8-15 mu m.
The hollow glass microspheres are made of borosilicate.
The zirconia is yttrium stabilized zirconia.
The method comprises the following steps:
(1) preparation of anticorrosive pigments
The preparation method of the siloxane modified strontium aluminum polyphosphate comprises the following steps of; respectively weighing ethanol, water, gamma-aminopropyltriethoxysilane and strontium aluminum phosphate according to a weight ratio of 0.2-1.0: 0.4-1.2: 0.03: 0.4, uniformly mixing the ethanol and the water, adding the gamma-aminopropyltriethoxysilane, uniformly stirring to form a mixed solution, adding the strontium aluminum phosphate into the mixed solution, carrying out condensation reflux for 6-10 h in a water bath at 85-95 ℃, carrying out centrifugal separation and drying to obtain siloxane modified strontium aluminum polyphosphate;
the preparation method of the organic zinc modified strontium potassium polyphosphate comprises the following steps of; respectively weighing strontium potassium phosphate, benzotriazole, zinc acetate and N, N-dimethylformamide according to a weight ratio of 1.8-3.0: 1-1.2: 1: 40, mixing, performing condensation reflux for 6-10 h at 125 ℃ in an oil bath, performing centrifugal separation, and drying to obtain organic zinc modified strontium potassium polyphosphate;
(2) preparation of component one
Preparing materials: respectively weighing the mixed resin, the anticorrosive pigment, the heat-insulating filler and the diluent according to the proportion;
grinding: respectively adding an anticorrosive pigment, a heat insulation filler and a diluent into the mixed resin, uniformly stirring, grinding in a sand mill until the fineness is lower than 40 micrometers, and discharging to obtain a component I;
mixing a component I and a component II: and weighing the component I and the component II according to the proportion, and uniformly stirring to obtain the high-temperature-resistant heat-insulating anticorrosive coating.
The method comprises the following steps:
1) substrate surface treatment: blowing sand or polishing the surface of the substrate, and cleaning the surface of the substrate by using a cleaning agent such as solvent oil for later use;
2) coating: coating a coating with the thickness of 0.1-1 mm on the surface of the substrate with the treated surface by adopting an air spraying, brushing or roller coating method;
3) and (3) curing: baking the coated high-temperature-resistant heat-insulating anticorrosive paint in a drying oven at 200 ℃ for 3 hours to completely cure the coating;
4) the obtained high-temperature-resistant heat-insulating anticorrosive paint should be used up in 8 hours.
The present invention is described in further detail below. A high temperature resistant thermal insulation anticorrosive coating is characterized in that: the composition is prepared by mixing a component I and a component II, wherein the weight ratio of the component I to the component II is 100: 30-35; the component one is composed of a mixture of mixed resin, anticorrosive pigment, heat-insulating filler and diluent; the mixed resin accounts for 25-30% of the weight of the mixture, the anticorrosive pigment accounts for 15-25% of the weight of the mixture, the heat insulation filler accounts for 23-25% of the weight of the mixture, and the balance is diluent; the mixed resin is a mixture of a polysilazane precursor and an organic silicon resin, and the mixing weight ratio of the polysilazane precursor to the organic silicon resin is 1-1.5: 2; the anticorrosive pigment is a mixture of siloxane modified strontium aluminum polyphosphate, organic zinc modified strontium potassium polyphosphate and basalt chopped fiber, and the mixing weight ratio of the siloxane modified strontium aluminum polyphosphate, the organic zinc modified strontium potassium polyphosphate and the basalt chopped fiber is 1: 1-1.5: 0.3-0.5; the heat insulation filler is a mixture of zirconium oxide, tin antimony oxide and hollow glass microspheres, and the mixing weight ratio of the zirconium oxide, the tin antimony oxide and the hollow glass microspheres is 1.5-2: 1: 0.5-1; the diluent is a mixture of xylene and n-butanol at a weight ratio of 7: 3. The component two is ethyl orthosilicate.
The preparation method of the high-temperature-resistant heat-insulating anticorrosive paint is characterized by comprising the following steps:
1. preparing an anticorrosive pigment:
1.1 siloxane modified strontium aluminum polyphosphate
Respectively weighing ethanol, water, gamma-aminopropyltriethoxysilane and strontium aluminum phosphate according to a weight ratio of 0.2-1.0: 0.4-1.2: 0.03: 0.4, uniformly mixing the ethanol and the water, adding the gamma-aminopropyltriethoxysilane, uniformly stirring to form a mixed solution, adding the strontium aluminum phosphate into the mixed solution, carrying out condensation reflux for 6-10 h in a water bath at 85 ℃, carrying out centrifugal separation and drying to obtain the siloxane modified strontium aluminum polyphosphate.
1.2, organic zinc modified strontium potassium polyphosphate
Respectively weighing strontium potassium phosphate, benzotriazole, zinc acetate and N, N-dimethylformamide according to the weight ratio of 1.8-3.0: 1-1.2: 1: 40, mixing, condensing and refluxing for 6-10 h under an oil bath at 125 ℃, and performing centrifugal separation and drying to obtain the organic zinc modified strontium potassium polyphosphate.
2. Preparing a first component:
2.1, preparing materials: respectively weighing the mixed resin, the anticorrosive pigment, the heat-insulating filler and the diluent according to the proportion;
2.2, grinding: adding the anticorrosive pigment, the heat-insulating filler and the diluent into the mixed resin respectively, stirring for more than 5 minutes until the materials are uniform, then putting the materials into a sand mill for grinding until the fineness is lower than 40 mu m, and discharging to obtain the component I.
2.3, mixing the component I and the component II: weighing the component I and the component II according to the proportion, and stirring until the materials are uniform to obtain the high-temperature-resistant heat-insulating anticorrosive coating; the obtained high-temperature-resistant heat-insulating anticorrosive paint should be used up in 8 hours.
The use method of the high-temperature-resistant heat-insulating anticorrosive paint is characterized by comprising the following steps:
1. substrate surface treatment: blowing sand or polishing the surface of the substrate, and cleaning the surface of the substrate by using a cleaning agent such as solvent oil for later use;
2. coating: coating a coating with the thickness of 0.1-2 mm on the surface of the substrate with the treated surface by adopting an air spraying, brushing or roller coating method;
3. and (3) curing: and baking the coated high-temperature-resistant heat-insulating anticorrosive paint in a drying oven at 200 ℃ for 3 hours to completely cure the coating.
Example 1
1. Preparing an anticorrosive pigment:
1.1 siloxane modified strontium aluminum polyphosphate
Respectively weighing ethanol, water, gamma-aminopropyltriethoxysilane and strontium aluminum phosphate according to the weight ratio of 1: 0.4: 0.03: 0.4, uniformly mixing the ethanol and the water, adding the gamma-aminopropyltriethoxysilane, uniformly stirring to form a mixed solution, adding the strontium aluminum phosphate into the mixed solution, carrying out condensation reflux for 6 hours in a water bath at 85 ℃, carrying out centrifugal separation and drying to obtain the siloxane modified strontium aluminum polyphosphate.
1.2 organic zinc modified strontium potassium polyphosphate
Respectively weighing strontium potassium phosphate, benzotriazole, zinc acetate and N, N-dimethylformamide according to the weight ratio of 1.8: 1: 40, mixing, condensing and refluxing for 6h under 125 ℃ oil bath, centrifuging and drying to obtain the organic zinc modified strontium potassium polyphosphate.
2. Preparing a first component:
2.1, preparing materials: respectively weighing the mixed resin, the anticorrosive pigment, the heat-insulating filler and the diluent according to the proportion;
| composition (I) | Specification of | Content (wt.) |
| Boron-containing polysilazane precursor | Industrial grade | 5 |
| Yttrium-containing polysilazane precursor | Industrial grade | 5 |
| Silicone resin | Industrial grade | 20 |
| Siloxane modified strontium aluminum polyphosphate | Self-made | 10 |
| Organic zinc modified strontium potassium polyphosphate | Self-made | 10 |
| Basalt chopped fiber | Industrial grade | 5 |
| Zirconium oxide | Industrial grade | 12.5 |
| Antimony tin oxide | Industrial grade | 8.3 |
| Hollow glass microspheres | Industrial grade | 4.2 |
| Xylene | Industrial grade | 14 |
| N-butanol | Industrial grade | 6 |
2.2, grinding: adding the anticorrosive pigment, the heat-insulating filler and the diluent into the mixed resin respectively, stirring until the materials are uniform, then putting the materials into a sand mill for grinding until the fineness is lower than 40 mu m, and discharging to obtain the component I.
2.3, mixing the component I and the component II: weighing the first component and the second component according to the proportion of 100:30, and stirring until the materials are uniform to obtain the high-temperature-resistant heat-insulating anticorrosive coating; the obtained high-temperature-resistant heat-insulating anticorrosive paint should be used up in 8 hours.
The use method of the high-temperature-resistant heat-insulating anticorrosive paint is characterized by comprising the following steps:
1. substrate surface treatment: blowing sand or polishing the surface of the substrate, and cleaning the surface of the substrate by using a cleaning agent such as solvent oil for later use;
2. coating: coating the coating with the thickness of 0.3mm on the surface of the substrate with the treated surface by adopting an air spraying, brushing or roller coating method;
3. and (3) curing: and baking the coated high-temperature-resistant heat-insulating anticorrosive paint in a drying oven at 200 ℃ for 3 hours to completely cure the coating.
The prepared steel sample coated with the high-temperature-resistant heat-insulating anticorrosive coating has excellent high-temperature resistance, and the coating is complete in surface, free of cracking and free of falling after being baked for 1000 hours at 600 ℃ through tests. The coating has excellent corrosion resistance, and the surface of the coating is complete, has no rust, does not bubble and does not fall off after being tested and stored for 1200h under neutral salt spray. The thickness of the coating is 0.3mm, the heat insulation effect of the coating is 25 ℃, and the coating has excellent heat insulation performance.
Example 2
1. Preparing an anticorrosive pigment:
1.1 siloxane modified strontium aluminum polyphosphate
Respectively weighing ethanol, water, gamma-aminopropyl triethoxysilane and strontium aluminum phosphate according to the weight ratio of 0.2: 1.2: 0.03: 0.4, uniformly mixing the ethanol and the water, adding the gamma-aminopropyl triethoxysilane, uniformly stirring to form a mixed solution, adding the strontium aluminum phosphate into the mixed solution, carrying out condensation reflux for 10 hours in a water bath at 90 ℃, carrying out centrifugal separation and drying to obtain the siloxane modified strontium aluminum polyphosphate.
1.2 organic zinc modified strontium potassium polyphosphate
Respectively weighing strontium potassium phosphate, benzotriazole, zinc acetate and N, N-dimethylformamide according to the weight ratio of 3: 1.2: 1: 40, mixing, condensing and refluxing for 10h at 125 ℃ in an oil bath, centrifuging, and drying to obtain the organic zinc modified strontium potassium polyphosphate.
2. Preparing a first component:
2.1, preparing materials: respectively weighing the mixed resin, the anticorrosive pigment, the heat-insulating filler and the diluent according to the proportion;
2.2, grinding: adding the anticorrosive pigment, the heat-insulating filler and the diluent into the mixed resin respectively, stirring until the materials are uniform, then putting the materials into a sand mill for grinding until the fineness is lower than 40 micrometers, and discharging to obtain the component I.
2.3, mixing the component I and the component II: weighing the first component and the second component according to the proportion of 100:35, and stirring for more than 5 minutes until the materials are uniform to obtain the high-temperature-resistant heat-insulating anticorrosive paint; the obtained high-temperature-resistant heat-insulating anticorrosive paint should be used up in 8 hours.
The use method of the high-temperature-resistant heat-insulating anticorrosive paint is characterized by comprising the following steps:
1. substrate surface treatment: blowing sand or polishing the surface of the substrate, and cleaning the surface of the substrate by using a cleaning agent such as solvent oil for later use;
2. coating: coating the coating with the thickness of 0.8mm on the surface of the substrate with the treated surface by adopting an air spraying, brushing or roller coating method;
3. and (3) curing: and baking the coated high-temperature-resistant heat-insulating anticorrosive paint in a drying oven at 200 ℃ for 3 hours to completely cure the coating.
The prepared steel sample coated with the high-temperature-resistant heat-insulating anticorrosive coating has excellent high-temperature resistance, and the coating is complete in surface, free of cracking and free of falling after being baked for 1000 hours at 600 ℃ through tests. The coating has excellent corrosion resistance, and the surface of the coating is complete, has no rust, does not bubble and does not fall off after being stored for 1500 hours under neutral salt spray. The thickness of the coating is 0.8mm, the heat insulation effect of the coating is 70 ℃, and the coating has excellent heat insulation performance.
Claims (9)
1. A high-temperature-resistant heat-insulating anticorrosive paint is characterized in that: the water-based paint is formed by mixing a component I and a component II, wherein the component II is tetraethoxysilane; the component one consists of a mixture of mixed resin, anticorrosive pigment, heat-insulating filler and diluent; the mixed resin is a mixture of a polysilazane precursor and an organic silicon resin, and the weight ratio of the polysilazane precursor to the organic silicon resin is 1-1.5: 2; the anticorrosive pigment is a mixture of siloxane modified strontium aluminum polyphosphate, organic zinc modified strontium potassium polyphosphate and basalt chopped fiber, and the weight ratio of the siloxane modified strontium aluminum polyphosphate, the organic zinc modified strontium potassium polyphosphate and the basalt chopped fiber is 1: 1-1.5: 0.3-0.5; the heat insulation filler is a mixture of zirconium oxide, tin antimony oxide and hollow glass microspheres, and the mixing weight ratio of the zirconium oxide, the tin antimony oxide and the hollow glass microspheres is 1.5-2: 1: 0.5-1; the diluent is a mixture of xylene and n-butanol, and the weight ratio of xylene to n-butanol is 7: 3; in the first component, the mixed resin accounts for 25-30% of the weight of the mixture, the anticorrosive pigment accounts for 15-25% of the weight of the mixture, the heat-insulating filler accounts for 20-25% of the weight of the mixture, and the balance is diluent; the weight ratio of the component I to the component II is 100: 30-35.
2. The high-temperature-resistant, heat-insulating and anticorrosive paint as claimed in claim 1, characterized in that: the polysilazane precursor is any one of polysilazane precursors containing boron, zirconium or yttrium, or a mixture of any two of the polysilazane precursors containing boron, zirconium or yttrium in equal weight ratio.
3. The high-temperature-resistant, heat-insulating and anticorrosive paint as claimed in claim 1, characterized in that: the length range of the basalt chopped fiber is 1-5 mu m.
4. The high-temperature-resistant, heat-insulating and anticorrosive paint as claimed in claim 1, characterized in that: the wall thickness range of the hollow glass microsphere is 0.5-1 μm.
5. The high-temperature-resistant, heat-insulating and anticorrosive paint according to claim 3, characterized in that: the diameter size range of the hollow glass microspheres is 8-15 mu m.
6. The high-temperature-resistant, heat-insulating and anticorrosive paint according to claim 4, characterized in that: the hollow glass microspheres are made of borosilicate.
7. The high-temperature-resistant, heat-insulating and anticorrosive paint as claimed in claim 1, characterized in that: the zirconia is yttrium stabilized zirconia.
8. The preparation method of the high-temperature-resistant, heat-insulating and anticorrosive paint as claimed in claim 1, characterized in that the method comprises the following steps:
(1) preparation of anticorrosive pigments
The preparation method of the siloxane modified strontium aluminum polyphosphate comprises the following steps of; respectively weighing ethanol, water, gamma-aminopropyltriethoxysilane and strontium aluminum phosphate according to a weight ratio of 0.2-1.0: 0.4-1.2: 0.03: 0.4, uniformly mixing the ethanol and the water, adding the gamma-aminopropyltriethoxysilane, uniformly stirring to form a mixed solution, adding the strontium aluminum phosphate into the mixed solution, carrying out condensation reflux for 6-10 h in a water bath at 85-95 ℃, carrying out centrifugal separation and drying to obtain siloxane modified strontium aluminum polyphosphate;
the preparation method of the organic zinc modified strontium potassium polyphosphate comprises the following steps of; respectively weighing strontium potassium phosphate, benzotriazole, zinc acetate and N, N-dimethylformamide according to a weight ratio of 1.8-3.0: 1-1.2: 1: 40, mixing, performing condensation reflux for 6-10 h at 125 ℃ in an oil bath, performing centrifugal separation, and drying to obtain organic zinc modified strontium potassium polyphosphate;
(2) preparation of component one
Preparing materials: respectively weighing the mixed resin, the anticorrosive pigment, the heat-insulating filler and the diluent according to the proportion;
grinding: respectively adding an anticorrosive pigment, a heat insulation filler and a diluent into the mixed resin, uniformly stirring, grinding in a sand mill until the fineness is lower than 40 micrometers, and discharging to obtain a component I;
mixing a component I and a component II: and weighing the component I and the component II according to the proportion, and uniformly stirring to obtain the high-temperature-resistant heat-insulating anticorrosive coating.
9. The use method of the high-temperature-resistant, heat-insulating and anticorrosive paint as claimed in claim 1, characterized in that the method comprises the following steps:
1) substrate surface treatment: blowing sand or polishing the surface of the substrate, and cleaning the substrate by using a solvent oil cleaning agent for later use;
2) coating: coating a coating with the thickness of 0.1-1 mm on the surface of the substrate with the treated surface by adopting an air spraying, brushing or roller coating method;
3) and (3) curing: baking the coated high-temperature-resistant heat-insulating anticorrosive paint in a drying oven at 200 ℃ for 3 hours to completely cure the coating;
4) the obtained high-temperature-resistant heat-insulating anticorrosive paint should be used up in 8 hours.
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